foo.cc: In function 'int main()':
foo.cc:37:13: warning: 'h' may be used uninitialized in this function [-Wmaybe-uninitialized]
     picture3(h);
     ~~~~~~~~^~~
foo.cc:35:13: warning: 'g' may be used uninitialized in this function [-Wmaybe-uninitialized]
     picture3(g);
     ~~~~~~~~^~~
foo.cc:33:13: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
     picture3(r);
     ~~~~~~~~^~~

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